Fluid composition



UNITED STATES PATENT OFFICE FLUID COMPO SITION Jules Bebie and George L. Doelling, St. Louis, Mo., assignors to Wagner Electric Corporation, St. Louis, Mo., a corporation of Delaware No Drawing. Application June 29, 1932, Serial No. 619,993

3 Claims. (Cl. 252-) Our invention relates to a fluid composition a fluid having the following composition has very suitable for use in fluid pressure devices such satisfactory characteristics:

as hydraulic actuating apparatus for vehicle Parts by brakes and in its more specific aspect constitutes Volume 5 an improvement in the castor oil-alcohol type Castor oil 35 60 of fluid now in general use for this purpose, this Ethyl ester of ortho toluene sulfonamid last mentioned fluid consisting chiefly of castor Ethyl ester of para toluene sulfonamid 10 Oil and ethyl alcohol in approximately equal Ethyl alcohol 5 proportlons' A fluid of the foregoing composition does not @522 f fititfr ti stiiif fitiiitttt 3321i at 40 degrees Fahr. and is of satisfactory VlS- as very low freezmg point; substantially noncosity throughout the operating temperature volame at temperatures a to at 300 range. Since oils other than castor oil may be grees Fahr'; lwlthout phys 1a1 or chemlcal effect suitable for use in the composition, provided they upon rubber non'corroswe to metals, F are stable under substantial range of temperacopperibmss s i steekfillmve tg tf l ture, have low solidifying point; and do not affect P p an Orm a m 011 6 me a rubber, we do not desire the our invention in faces of the cylinders v r w i h pist ns and its broadest aspect be limited toafluid embodying piston sealing cups move, which will constitute castor oil as the main lubricating element. 75 protection against atmospheric corrosion. Having fully described our invention, what we A hydraulic brake fluid consisting of alcohol claim as new and desire to secure by Letters and castor oil falls short of ideal fulfillment of Patent 0f the United $tate5 is? the above desiderata but does have the important An r t fiuld for fluld pressure paadvantage of being relatively inexpensive. We ratus compnsmg alcohol toluene Pl m have found that a greatly improved fluid is ester, and an 011 characterized by low solidifying cured by adding to the alcohol-castor oil mixture pomt and mertness toward rubber' 2. The combination with a fluid pressure device a mal uantit of a toluene s lfonamid ester. f plrgduces liquid havingua much 10w er comprising exposed rubber and metal, of an operating fluid therein comprising castor oil, alco- 0U freezing point, less deteriorating effect on rubhol and atoluene sulfonamid ester.

ber, and less corrosion of the metal parts due An Operating fluid for fluid pressure appa to the better film which the fluid We ratus consisting of castor oil in approximately have alSO found that the solidifying point is parts by volume, ethyl ester of ortho toluene s a y ow d instead Of a Single sulfonamid in approximately 10 parts by volume, toluene sulfonamid ester, substantially equal ethyl ester of para toluene sulfonamid in portions of ethyl ester of ortho toluene sulfonamid proximately 10 parts by volume, and ethyl alcohol and ethyl ester of para toluene sulfonamid are in approximately parts by volume.

employed. JULES BEBIE.

40 While the proportions may be somewhat varied, GEORGE L. DOELLING. 9 5 d 

